diff --git a/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.cpp b/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.cpp
index 34e56be520db6464e8777e7aaa77c8eb229d67a7..7c13284b0cf1996c824482d12787cfe8b80f074c 100644
--- a/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.cpp
+++ b/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.cpp
@@ -10,7 +10,6 @@
 
 #include "FluidThermalExpansion.h"
 
-#include "MaterialLib/MPL/Utils/FormKelvinVectorFromThermalExpansivity.h"
 #include "MaterialLib/MPL/Utils/GetLiquidThermalExpansivity.h"
 
 namespace ProcessLib::ThermoRichardsMechanics
diff --git a/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.h b/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.h
index d960c79e41c7aab1195eacdd63c407703c8582b2..35569660c475bf574b57b2ace97e7ebb4b213792 100644
--- a/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.h
+++ b/ProcessLib/ThermoRichardsMechanics/Constitutive/FluidThermalExpansion.h
@@ -11,7 +11,6 @@
 #pragma once
 
 #include "LiquidDensity.h"
-#include "MathLib/KelvinVector.h"
 #include "Porosity.h"
 #include "SolidThermalExpansion.h"